public static Gif DecodeParallelExample()
{
var bytes = File.ReadAllBytes(Path);
var stopwatch = new Stopwatch();
stopwatch.Start();
var decodeProgress = new DecodeProgress();
Gif.DecodeParallel(bytes, progress =>
{
Console.WriteLine("Decode progress: {0}/{1}", progress.Progress, progress.FrameCount);
decodeProgress = progress;
});
while (decodeProgress.Exception == null && !decodeProgress.Completed)
{
Thread.Sleep(100);
}
if (decodeProgress.Exception != null)
{
throw decodeProgress.Exception;
}
stopwatch.Stop();
var gif = decodeProgress.Gif;
if (gif != null)
{
Console.WriteLine("GIF decoded in {0:n2}s, size: {1}x{2}, frames: {3}.", stopwatch.Elapsed.TotalSeconds,
gif.Frames[0].Texture.width, gif.Frames[0].Texture.height, gif.Frames.Count);
}
return(gif);
}
/// <summary>
/// Decode byte array in multiple threads.
/// </summary>
public static void DecodeParallel(byte[] bytes, Action <DecodeProgress> onProgress) // TODO: Refact
{
if (_free)
{
throw new Exception("The Free version doesn't support this feature. Please consider buying the Full version of Power GIF.");
}
GifParser parser;
try
{
parser = new GifParser(bytes);
}
catch (Exception e)
{
onProgress(new DecodeProgress {
Exception = e, Completed = true
});
return;
}
var decoded = new Dictionary <ImageDescriptor, byte[]>();
var frameCount = parser.Blocks.Count(i => i is ImageDescriptor);
var decodeProgress = new DecodeProgress {
FrameCount = frameCount
};
for (var i = 0; i < parser.Blocks.Count; i++)
{
var imageDescriptor = parser.Blocks[i] as ImageDescriptor;
if (imageDescriptor == null)
{
continue;
}
var data = (TableBasedImageData)parser.Blocks[i + 1 + imageDescriptor.LocalColorTableFlag];
ThreadPool.QueueUserWorkItem(context =>
{
if (decodeProgress.Completed || decodeProgress.Exception != null)
{
return;
}
byte[] colorIndexes;
try
{
colorIndexes = LzwDecoder.Decode(data.ImageData, data.LzwMinimumCodeSize);
}
catch (Exception e)
{
decodeProgress.Exception = e;
decodeProgress.Completed = true;
onProgress(decodeProgress);
return;
}
lock (decoded)
{
decoded.Add(imageDescriptor, colorIndexes);
decodeProgress.Progress++;
if (decoded.Count == frameCount)
{
try
{
decodeProgress.Gif = CompleteDecode(parser, decoded);
decodeProgress.Completed = true;
}
catch (Exception e)
{
decodeProgress.Exception = e;
decodeProgress.Completed = true;
}
}
onProgress(decodeProgress);
}
});
}
}
